A123180 - OEIS

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A123180

Even positions of Sylvester's sequence A000058; the denominators of the (greedy) Egyptian fraction expansion of Cahen's constant.

2, 7, 1807, 10650056950807 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,1`
	REFERENCES	`E. Cahen, (1891). "Note sur un developpement des quantites numeriques, qui presente quelque analogie avec celui en fractions continues". Nouvelles Annales de Mathematiques 10: 508-514.`
	LINKS	`Cahen's constant`
	FORMULA	`a(n) = a(n-1)(a(n-1)-1)(a(n-1)(a(n-1)-1)+1)+1`
	CROSSREFS	`Cf. A000058, A006279, A006280, A006281, A118227.` `Sequence in context: A082891 A000653 A128847 * A138198 A144836 A174308` `Adjacent sequences: A123177 A123178 A123179 * A123181 A123182 A123183`
	KEYWORD	`easy,nonn`
	AUTHOR	`David Eppstein (eppstein(AT)ics.uci.edu), Oct 03 2006`

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Last modified February 14 23:53 EST 2012. Contains 205689 sequences.